Valve-grinding tool



Jul so, 1929.- G, s, ISKYAN 1,722,577

VALVE GRINDING TOOL Filed May 11, 1928 A ATTORNEY Patented July 30,1929..

UNITED STATES GEORGE S. ISKYAN, F LONG ISLAND CITY,

PATENT OFFICE.

NEW YORK, ASSIGNOR T0 G. M. 00. MANU- FACTURING COMPANY, me, or LONGISLAND CITY, NEW YORK, A. CORPORATION OF NEW YORK.

VALVE-GRINDING TOOL.

Application filed May 11,

My invention relates to improvements in a valve grinding tool adaptedespecially for operation on the valves of internal combustion engines.

This invention has for its main object to provide a valve grinding toolof the character hereinafter described, which is simple in construction,inexpensive to manufacture and highly efficient in operation.

Briefly, the present invention comprehends a valve grinding tooloperated to impart alternating angular movements of a valve in oppositedirections in such manner that the movements of the valve will tend toproperly grind the latter against its seat. A further object of myinvention is to provide an improved mechanism for effecting suchmovements and I accomplish this object by means of the arrangement andcombinations of parts hereinafter fully described in the specification,set forth in the appended claims and illustratively exemplified in theaccompanying drawings, in which, Figure 1 is a substantiallylongitudinal sectional view of .the

invention; and Figure 2 is an elevational view of the same with aportion removed to Eli disclose the mechanisms for imparting movementsto the grinder.

Referring to the drawings, denotes a metal housing comprising acylindrical portion 11 and a dome shaped portion 12 closing one endthereof. An upright spindle 13 is rotatably mounted in openings 14disposed in opposite sides of the wall of the cylindrical portion 11 ofthe housing. The upper end of the spindle 13 beyond the housing 10 isprovided with a ferrule 15 disposed between the housing and a handle orgrip member 16, which is rotatably mounted on the spindle 13 and whichis held in position thereon by a nut and washer 17 adjustable over thethreaded upper end of the spindle, the washer being seated against ashoulder 18 formed by a recess in the outer end of the handle. Below thehousing 10, the spindle 13 is slightly increased in diameter to providea shoulder 19, which is brought to bear against the wall of thecylindrical portion 11 by adjustment of the nut 17. The extreme lower orworking end of the spindle 13 is forked to accommodate a bit 20 forengaging the valve to be ground, the bit 20 being preferably pivoted inthe forked end of a ivot pin 21.

The "ortion of t espindle 13 within the cylindrical portion 11 of thehousing is pro- 1928. Serial No. 276,837.

vided with'a pair of spaced projecting pins 22, WlllCh operate close tothe opposite inner sides of the cylindrical portion 11 and projectstowards the dome like closed wall 12, and which are slightly offset withrespect to each other along the longitudinal axis of the spindle, asshown in Figure 2.

A driving shaft 23 is journaled in a bearng 24 mounted in the closed end12 of hous- 1ng 10, said shaft 23 being disposed counter to the spindle13 and on an axis which bisects the axis of the spindle 13 midwaybetween the two pins 22. The bearing 24 comprises a tubular memberthrough which the driving shaft 23 projects, the opposite ends of thetubular member being turned in to provide a bore or opening which willprovide a running fit for spaced points on the shaft 23. The end of thebearing 24 adjacent the closed end 12 of the housing is provided with anannular groove 25 into which the wall of the opening in the closed end12 is permanently secured. This construct-ion provides a short collar 26just outside of the dome end against which the hub 27 of a crank handle28 revolves, the hub 27 being an integral part of the driving shaft 23.

The opposite end of the driving shaft 23 receives a star wheel 29comprising a three armed blade slightly concave in the direction of thebearing 24. The star wheel 29 revolves within the cylindrical portion 11of the housing between the spindle 13 and the said bearing 24 and thetip portions of the arms move through a path intercepted by the pins 22.The star wheel is held in position by turning over the end of thedriving shaft- 23, as illustrated in Figure 1.

The open end of the housing 10 is closed by a cover piece 30 comprisinga disc like face and projecting skirt like run 31, which is adapted tofit within the wall of of the cylindrical portion 11 and which isprovided with cut outs 32 to accommodate the wall of the spindle 13which is disposed closely adjacent the open end of the housing.

In the operation of this device, the bit 20 is placed in engagement withthe valve and the tool is held in upright position by gripping thehandle 16 in one hand and manipulating the crank handle 28 with theother. Rotary movement of the star wheel 29 with the drivingshaft 23brings the tip of 911e arm first against one side of the up er pm. 22causing it; to move to the side in die attraction of re tation of thecrank handle, andthen as the same arm moves to complete the lower half,

of the axis thereof the arms simply slide past the pins. 'ltis pointedout, thatL due to the curvature.ofztheiwall of the cylindricalporrtionxll on opposite sidesof the spindle 13 and :the position of thepins 22 therein with respect "to said-wallthepins 22 contact with theinner 15 :faoeof thewallif the spindle 13has any tendency to turnfurther in either direction than --.thati4.caused by the-,movement ofthe star,

Avheel. :-;This condition will prevent the pins22ifiroimbeingaccidentally moved to a posi- Qztion nvlliehlwonldbringthem out of the path 7 of the arms of the star wheel 29. Continuousrotation of; the crank handle 28 will repeat -!fl1B;OpGl1llll,0n justdescribed and a rapid oscil- .:1ating movement ,of the valve vupon itsseat acent; its opposite ends.

willfresult,=.whereby tlie-fvalve and the valve seat Will be ground.

Hav ng described my inventlon what I c laim and desire tosecurebyLetters Patent 1. Avalve grinding tool,'con'iprisi-ng an uprightspindle for turning the valve, a driving shaft disposed at an angle tothe spindle, means operated by the shaft for imparting oscillatorymovement to-the-vspindle, a housing supported on.-the spindle andenclosing saidaneans and a bearingmember mounted in said housing andsupportingthe shaft adri .valveg-rinddig tOUl,'LS claimed in claim .1,.in wvhichythe :hOllSlIJg comprises .a cylindrical portion having; adome .shaped closed end and. acover vfor the open end, and the, bearingcomprises a-tubularl member, disposed about theshaft and contracted atop po- .site ends to form abearing for both. ends of said shalt.

Intestimony whereotl afiix my signature.

GEORGE S. ISKYAN.

